martes, 28 de septiembre de 2010


1.Renewable resource: a resource that can be replaced in a short period of time.

2.Ozone layer: a layer of ozone gas in the atmosphere that screens out much of the Sun's UV rays.

3.Fossil fuel: a fuel formed from the decay of ancient forms of life.

4.Smog: a mixture of smoke and fog.

5.Acid rain: moisture that falls to Earth after being mixed with wastes from burned fossil fuels.

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